Mold for manufacturing hollow glassware.



No. 932,957. ,PatemewAiug; 29,1899.

n. mossenovs, 1n. MOLD FOR MANUFACTURING HOLLOW GLASSWARE.

7 (Application filed Nov. 28, 1898.)

I gm"? 1 mv II WM K 9 WITNESSES: 1

UNITED STATES PATENT OFFICE.

ROSS MOSSGROVE, JR., OF STEUBENVILLE, OHIO, ASSIGNOR OF ONE-HALF TO EMME'IT MOD. MCKEE, OF SAME PLACE.

MOLD FOR MANUFACTURING HOLLOW GLASSWARE.

SPECIFICATION forming part of Letters Patent No. 632,057, dated August 29, 1899.

Application filed November 26,1898. Serial No. 697,546. (No model.)

To all 11:71.01 it may concern: closure the exact contour of the corrugated Be itknown that 1, Ross MOssGROVE, Jr., a curved walls and curved bottom of the bulb citizen of the United States, residing at Steuand forming and shaping the corrugation benville, in the county of Jefferson and State thereof. Informing this skeleton closure the 5 of Ohio, have inventeda new and useful Immatrix-rods terminate in curved ends and provement in Molds for the Manufacture of form a circle, by which the corrugations are I-Iollow Glassware, of which the following is a caused to terminate in the bottom of the bulb. specification. In this mold the rods form the only solid parts The invention herein is particularly directof the matrix and support the glass against 10 ed to the production of a mold or matrix for the internal pressure of the blowing force the manufacture of blown corrugated bulbs and cause the swell parts of the glass to take for incandescent electric-light lamps, wherethe exact curved forms of the rods in formby the natural vitreous polish and brilliancy ing the longitudinal outline of the corrugaof the glass is preserved, the light-retracting tions. 7 In this action the matrix-rods have r 5 capacityof the bulbincreased,and abeautiful the eifect by their curved form of drawing efiect produced in the light-rays. For this and guiding the glass, so as to cause it to folpurpose my invention resides in a two-part low their curves, and thereby determine the skeleton metal matrix, the walls of which are contour of the bulb and of its longitudinal open and formed of rods or bars having the corrugations. In this molding process the 2o contour of the bulb and having a relation to valley or concave surface parts only have coneach other, to a tubular neck part, and to a tact with the matrix-forming rods or bars, and

' bottom-forming part to produce the complete such contact-surfaces I form so as to enhance bulb havingthe characteristics stated, and as the natural vitreous polish and brilliancy of I will particularly set out in the claims conthe glass. 'Io effect this increased brilliancy 25 eluding this specification. of these surface parts and cause them to pro- It is well known in the art that glass articles duce rays of sparkling light, I form these valblown in solid metal molds are to a great ex- Icy-surface parts with one or more lines or tent deprived of the natural brilliancy and ridges or projections of prismatic or other vitreous polish of the glass, because, among forms in the deepest part thereof, so that they 0 other reasons, the contact of the hot glass with will practically stand transversely in relation the solid metal molding-walls produces effects to the longitudinal projecting corrugations, which destroys the vitreous polish and clearand thereby give the valleys a capacity for ness of the glass, and thereby causes diminuretracting light in sparkling rays. This eftion of the light emitted. Nor is the dull and feet is aided by the relation of the valley propartially-clouded eifect produced by a solid jections to the unbroken surfaces of the lonmetal mold 0n blown glass prevented by the gitudinal corrugations, the natural brilliancy well-known pasting of thematrix-surfacc, beof which will cooperate to fully develop the cause to obtain a polishing result from such prismatic effect of the valleycorrugations unpasting the article being molded or the mold der the light of the incandescent filament. o

40 must berotated in the process of blowing and Moreover, these valley corrugations serve to forming. Blown-glass articles having corruprevent the glass from sticking to the metal gated walls cannot be rotated while being rods. 'The bulb blown and shaped in this molded. way in complete form and finish in a skele- In producingthe bulb by myimproved skeleton closure is of uniform thickness and has 5 5 ton mold the natural vitreous polish of the the same interior and exterior conformation.

glass is preserved, giving a better refractive For the purpose of informing those skilled disposition of the light-rays and a greater in the art to which my invention appertains volume of light. To this end my new blown of the nature of my said invention and of inbulb is produced in a mold the walls of which structing them how the same may be advan- I00 50 are formed of curved rods or bars with opentageously employed I have shown one form ings between them and forminga skeleton of askeleton matrix-closure, whereby mynew glass bulb may be produced in the form which I prefer to employ it; but it will be understood that my invention is not limited to the precise. form and construction of parts, as various modifications may be made without exceeding the scope of the claims concluding this specification. In such illustrations I have also shown the article produced by said skeleton matrix.

Referring to the illustrations, Figure 1 represents in perspective my skeleton-formed matrix or molding closure with its divided parts open to permit the proper placing of the gather on the end of the blowpipe preparatory to blowing the bulb in the closed matrix. Fig. 2 is a like view showing the matrix closed, as when the bulb is being blown. Fig. 3 is a vertical section of the same, the bulb being shown as having been blown. Fig. 4 is a horizontal transverse section taken at the matrix-forming rods, showing the bulb corrugations as formed by the rods. Fig. 5 shows two forms of the matrix-forming rods. Fig. 6 shows in side view and in longitudinal and cross-section the glass bulb as formed by my process in any skeleton matrix-closure and illustrating the longitudinal and valley corrugations. Fig. 7 shows an enlarged section of the skeleton matrix-forming closure; and Fig. 8 is a vertical section, enlarged, of the bottom-forming part of the mold.

The mold or matrix is constructed of two half parts, each of which has matrix-forming rods or bars 1 disposed in each part to form a semicircle in cross-section with openings between the rods, having a width and longitudinal form corresponding to the corrugations, which are formed by blowing the glass in swells between the rods. In their closed relation these semicircularly disposed rods form the molding-closure. Each half-mold part is separately supported in a hanger 2 of angle-iron, which is separately mounted upon a suitable stud or post 3, whereon the matrixforming parts are adapted to be opened and closed as an overhanging mold. The hangers are bars, preferably of L shape, the lower horizontal arm of which is fitted to swing on collars or retainers at on the post, so that when these arm parts are joined at their edges they will be on the same plane. In these arm parts the lower ends of the matrix-forming rods are fitted, preferably by holes in the hanger-arms, while at their upper ends said rods are fitted,

preferably, by holes in the lower ends of vertically-divided tubular parts 5, which form the neck of the blown bulb and are retained by collars 6 on the post. Each of these tubular parts is mounted to swing freely on the post, so that when closed they form a tube centrally with the circle formed by the lower ends 7 of the matrix-forming rods.

The hangers by their vertical arms are each connected to a handle 8 of each divided tubular neck part, so that each hanger and its tubular top part form a housing for the skeleton-,matrix-forming-closure half parts. At

their neck connection the rods stand back a little from the tubular walls, as seen in Fig. 3, so as to form the shoulder 9 on the bulb at its junction with the neck, while starting from the lower end of the neck part the rods swell outward and terminate in under curves at their junction with the hanger horizontal arms, so as to leave a portion of their surface between the ends of the rods and a semicircular recess 10 at the meeting edges of said arms, so that when the latter are closed these edge recesses will form an opening centrally with the neck forming parts, as in Figs. 1, 2, and 8. This bottom circular opening and the rods terminating with a slight convex formation around the opening, as seen in Figs. 3 and 4, serve to give the proper symmetrical conformation to the closed end of the bulb and to the corrugations terminating therein. I prefer to construct the rods with straight ends 11, as in Figs. 3 and 11, so as to easily fit them in their retaining parts, to remove them, or to change them for rods of other forms or of different lengths where it isdesired to change the form or contour of the bulb and the design of its corrugationsas, for instance, to produce the'corrugations in oblique designs and bulbs of different lengths-but of whatever form they are freely engaged with their retaining parts, so as to render them interchangeable in their housing as matrix-forming parts having the contour and design of the bulb to be thereby produced.

As shown, the matrix-forming rods or bars are disposed four in each half of the matrix, and they are of a size in cross-section to give the proper width to the valley or concave corrugations in the bulb; but they may be varied in number and in the contour and form of their cross-section, the essential matter being a molding-closure of two equal parts, each part formed of curved rods and intervening openings surmounted by a solid semitubular part and seated in an arm part, each closureforming part being free to be opened and closed upon a support, the rods having the function to guide and to control the glass within their intervening openings in the production of the complete and finished bulb.

As the matrix-forming rods have the contour to give the curved swell form to the walls of the bulb, they must be retained in their proper relation to each otherto maintain their symmetrical contour, which would be destroyed if the rods were not held from turning on their ends, and for this purpose I make their ends of an angular form in cross-section and fit them into corresponding sockets or holes in their retaining parts, or the rods may be clamped by screws 12 in the neck-forming parts, as in Fig. 3.

While I have made provision for interchanging the matrix-forming rods producing difierent designs of bulbs, the construction also provides for the adjustment of the matrix-housing for the manufacture of bulbs of different lengths. This provision consists in adjusting up or down the housing angle-bars on their post-support, so as to lessen or to increase the distance between the bottom an glearms and the neck-forming parts, and thereby admit of the use of longer or shorter matrixforming rods in the same hanger parts. The

means for making this adjustment may be by the collars between which the housing anglearms are confined on the post, said collars being clamped at the proper adjustment by screws, as in Fig. 3. In making this adjustment the upper ends of the angle housingarms, by means of slots 13, are free to move on the handles of the neck-forming parts and to which the said housing-arms are clamped by nuts 14: on threaded parts of the handles. It will be understood that in adjusting the housing-angle-arm parts they will be caused to move together on the post, so as to preserve their proper relation as seats for the matrixforming rods.

An important feature of my improvement is the provision on the matrix-forming sides of the curved rods of corrugations, projections, or scallops 15, Fig. 5, so that while the rods serve as guides to direct and control the moving glass over and into the openings between them they serve the further function of producing in the valleys of the bulb-walls corrugations which produce identical prismatic or other form of projections in lines along the deepest outer surface part of the valleys, which give out sparkling light-rays, increase the volume and brilliancy of the refracted light, and prevent the tendency of the glass to stick to the rods. I have shown two designs of these rod corrugations, and they may be varied in one or more lines on each rod.

In working with the mold a boy sits at the handled side to open and to close its hinged half parts. In its open position the blower, having collected on the end of the blowpipe a gather of plastic glass and rolled it on a forming-block, places it in the upper open end of the tubular neck, and the mold being then closed he blows the glass into form against the rods, which in their guiding and controlling function cause it to be forced between them and along their curves, conforming to the contour of the body and of the closed end of the bulb. The bulb having been thus formed complete,the mold is opened, the bulb is removed and broken at the neck from the blowpipe. In this way the complete bulbs are produced rapidly and with the advantage of a better light-refracting capacity than is possible with a solid metal mold.

There is an important action of the rods in causing the glass to swell out so that the corrugations will extend beyond the circumference of the circle formed by the rods to give full formation to the valleys in the walls of the bulb, and this result is due to the fact that rods offer no fiat surface between them for contact with the expanding glass, the sides of the rods retreating from the walls of the longitudinal corrugations, as in Figs. et and 7.

The state of the art shows that incandescent electric-light bulbs having longitudinal corrugations have been produced by blowing in a solid mold the inner walls of which have a conformation producing and corresponding with the corrugations of the bulb. It also shows that it is not new to form bottles with cylindrical corrugated walls in a mold having its inner circumferential outline formed of circularly arranged edgewise disposed blades or plate comparatively thin and many times greater in width than in thickness and in which the matrix-forming edges are at all points equidistant from the axis of the mold and form intervening openings into which the glass is blown to form the corrugations on the walls of the bottle; but so far as I know and can find corrugated bulbs for incandescent electric lamps have not prior to my invention been produced complete on a blowpipe in a skeleton matrix-closure formed by rods having the contour of the bulb and by their curved forms guiding and controlling the glass over and between the rods to form the walls and bottom of the bulb, nor a bulb in which the valleys of the corrugations are formed with transverse corrugations to increase the volume of the emitted light in the way stated.

I do not claim herein the described and illustrated bulb for incandescent electric-light lamps, since I have made the same the subject of a separate application for a patent filed of even date herewith.

I claim as my improvement 1. A mold for the manufacture of blown corrugated bulbs of the character described, consisting of two half parts, each part constructed of rods or bars arranged to form a skeleton molding-closure having the contour of the body and closed end of the bulb, a semitubular neck part surmounting and closing the openings between the upper ends of said matrix-forming rods, and a supporting bottom-forming part for said rods, the molding parts mounted to swing upon a post or support outside of the molding-closure.

2. A mold for the manufacture of corrugated bulbs of the character described, consisting of two half parts, each part constructed of rods or bars arranged in open relation and having the contour of the bulb, each half part of said rods forming a molding-closure surmounted by a semitubular part, and

a housing for each half part, the said neck and housing parts separately mounted to swing upon a post outside of the molding-closure.

3. In a mold for the manufacture of blown corrugated bulbs of the character described, and in combination, semitubular neck-forming parts, and bottom-forming hanger parts, each part mounted to separately swing on a support, rods or bars having their ends fitted in said neck and hanger parts and forming between them a skeleton molding-closure having the contour of the body and closed end of the bulb.

4. In a mold consisting of two hinged parts ,for the manufacture of blown corrugated bulbs, the combination of semitubular neckforming parts, and bottom-forming hanger parts, each part mounted to swing separately on a support, with rods or bars having their ends fitted in holes in said neck and hanger parts and forming between an open or skeleton molding-closure having the contour of the bulb, and means for adjusting said hanger parts, in relation to the neck parts, whereby the matrix-forming rods are rendered interchangeable for the purpose stated.

5. In a mold consisting of two hinged parts for the manufacture of blown corrugated bulbs the combination of semitubular neckforming parts and bottom-forming hanger parts, each-part mounted to swing independently on a support, with rods or bars having flat or angular ends fitted into corresponding holes in the neck and hanger parts and forming a skeleton molding-closure having the contour of the bulb, whereby the matrixforming rods are maintained or locked in symmetrical relation to each other.

6. In a mold consisting of two hinged parts for the manufacture of blown corrugated bulbs, the combination of semitubular neckforming parts and bottom hanger-forming parts, each part mounted to swing separately on a support, with rods or bars arranged to form intervening openings and having the contour of the bulb, the said neck and hanger parts having holes adapted to receive the ends of said rods, and means whereby they are secured to maintain their symmetrical relation to each other as a curved skeleton structure.

7. A skeleton molding-closure for the man ufacture of blown corrugated bulbs for incandescent electric-light lamps, constructed of two half-swing parts, each half part consisting' of a semitubular neck-forming part, a bottom-forming hanger part, and rods or bars seated in and between said neck and hanger parts and having the contour of the body and closed end of the bulb.

8. A molding-closure for the manufacture of blown corrugated bulbs for incandescent electric-light lamps, constructed of two half parts, each half part consisting of a semit-ubular neck-forming part, a bottom-forming hanger part, and rods or bars seated in and between said neck and hangerp'arts, and having their ends curving under and forming short convex bends at their engagement with the hanger parts, said convex bends being concentric with recesses in the meeting edges of the hanger parts forming therein a central opening, wherebythe corrugations formed by the rods are caused to terminate in a symmetrical conformation at the closed end of the bulb.

9. A skeleton molding-closure for blown corrugated bulbs of the character described, constructed of rods forming openings between them, said rods having the curved contour longitudinally of the bulb, and having corrugations or projections on their matrixforming faces, in combination with neck and bottom forming parts upon and between which the curved rods are mounted.

10. A skeleton molding-closure for blown glass bulbs of the character described, consisting of rods having the contour of the body and closed end of the bulb and mounted in end mold-forming parts.

11. In a mold for the manufacture of corrugated bulbs of the character described, the combination with a post or vertical support, of a molding-closure consisting of two half parts mounted to freely swing on said post to open and to close the mold, each half-mold part constructed of separate semitubular neck parts, and separate hanger parts, the latter connecting the outer ends of the neck parts and forming the housing for the molding-closure.

12. In a mold for the manufacture of corrugated bulbs, the combination with a post, of a skeleton molding-closure consisting of two half parts mounted to freely swing in closed and open relation on said post, collars on the latter for maintaining the relation of the molding parts, each half part constructed of rods having the contour of the bulb, endmolding parts connecting the rods and angle hanger parts connecting the rods and neck parts, the said hanger parts being vertically adjustable on the post and on the neck parts to suit molding-rods of different lengths.

In testimony whereof I have hereunto signed this specification, at Washington, District of Columbia, this 8th day of November,

ROSS MOSSGROVE, JR. Witnesses:

A. ROLAND JOHNSON, GUY H. JoHNsoN. 

